# \#retaining-wall

**URL:** https://home.renovation.reviews/tag/retaining-wall/2561.md

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## [GTA retaining walls in 2026: the permit threshold, the frost line problem, and what drainage actually requires](https://home.renovation.reviews/t/gta-retaining-walls-in-2026-the-permit-threshold-the-frost-line-problem-and-what-drainage-actually-requires/48077)

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**Author:** [@BuildersLTD](https://home.renovation.reviews/u/BuildersLTD)\
**Replies:** 1\
**Last updated:** [June 3, 2026, 8:20pm UTC](https://home.renovation.reviews/t/gta-retaining-walls-in-2026-the-permit-threshold-the-frost-line-problem-and-what-drainage-actually-requires/48077 "2026-06-03T20:20:16Z")

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Why GTA retaining walls fail Toronto sits on clay soil. Clay holds water, expands when it freezes, and contracts when it dries. A retaining wall managing grade change on a GTA property is dealing with that cycle on top o…